Article (Scientific journals)
Phenolic extracts obtained from thermally treated secondary varieties of dates: Antimicrobial and antioxidant properties
Mrabet, Abdessalem; García-Borrego, A.; Jiménez-Araujo, A. et al.
2017In LWT - Food Science and Technology, 79, p. 416-422
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Keywords :
Antibacterial; Antioxidant; Date; Phenolic extract; Thermal treatment; Degradation; Heat treatment; Liquid sugar; Oils and fats; Plants (botany); Solvent extraction; Sunflower oil; Anti-oxidant activities; Antioxidant properties; Bioactive compounds; Hydroxymethylfurfural; Phenolic extracts; Sugar degradation products; Antioxidants
Abstract :
[en] Palm dates are an important source of natural bioactive compounds and their application in the food industry could valorize secondary cultivars at risk of disappearing. Secondary palm date varieties were thermally treated by direct steam at two temperatures (140 and 160 °C) during 30 min. The liquid was extracted by organic solvent, obtaining two extracts, PE140 and PE160, with high concentrations of sugar degradation products, mainly hydroxymethylfurfural and phenolic compounds like tyrosol or gallic and protocatechuic acids. The use of the higher temperature produced 22 g of extract/Kg of fresh dates with antioxidant activities in the aqueous matrix (EC50 value of 2.72 mg/L for DPPH and TEAC value of 0.05 mmol Trolox®/g of extract) and remarkable protection against lipid oxidation in oils, increasing the stability of sunflower oil by the Rancimat method by four-fold. Promising values of inhibition against plant pathogens were found with values of MIC of 3.13 mg/mL. Therefore, thermal treatment of dates was effective for obtaining bioactive phenolic extracts suitable for food formulation. © 2017 Elsevier Ltd
Disciplines :
Food science
Author, co-author :
Mrabet, Abdessalem ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
García-Borrego, A.;  Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universitario Pablo de Olavide, Edificio 46, Ctra. de Utrera, Km 1, Seville, Spain
Jiménez-Araujo, A.;  Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universitario Pablo de Olavide, Edificio 46, Ctra. de Utrera, Km 1, Seville, Spain
Fernández-Bolaños, J.;  Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universitario Pablo de Olavide, Edificio 46, Ctra. de Utrera, Km 1, Seville, Spain
Sindic, Marianne  ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Chimie des agro-biosystèmes
Rodríguez-Gutiérrez, G.;  Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universitario Pablo de Olavide, Edificio 46, Ctra. de Utrera, Km 1, Seville, Spain
Language :
English
Title :
Phenolic extracts obtained from thermally treated secondary varieties of dates: Antimicrobial and antioxidant properties
Publication date :
21 January 2017
Journal title :
LWT - Food Science and Technology
ISSN :
0023-6438
eISSN :
1096-1127
Publisher :
Academic Press
Volume :
79
Pages :
416-422
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 07 September 2018

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